Destructive Photoadsorption of Freons on Atmospheric Aerosols Full article
Journal |
Zeitschrift fur Physikalische Chemie-International Journal of Research in Physical Chemistry and Chemical Physics
ISSN: 0942-9352 , E-ISSN: 2196-7156 |
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Output data | Year: 1999, Volume: 213, Number: 1, Pages: 9-16 Pages count : 8 DOI: 10.1524/zpch.1999.213.Part_1.009 | ||
Tags | Aerosols, Atmosphere, CaO, Freones, MgO, Photodestruction | ||
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Abstract:
Under discussion is possible impact of the solar light driven processes on the natural nontechnogeneous remediation of the Earth's atmosphere from freons. The paper concerns an expected role of photocatalytic and photosorption processes on tropospheric aerosols in Global Chemistry of the Earth's atmosphere as well as recent experimental data on photoadsorption phenomena over alkaline earth metal oxides like MgO and CaO at conditions of real Earth's atmosphere. Interaction of some freons like CF3CH2F (freon 134a) and CHF2Cl (freon 22) with the ambient air-exposed surface of magnesium oxide and calcium hydroxycarbonate under mild UV radiation, which corresponds to solar light in the troposphere, is shown to result in their efficient irreversible destructive adsorption. The above photoactivity appears to be related with an optical absorption, detected at wavelengths ranging within 300-400 nm and caused presumably by some surface compounds. The photoadsorption is observed for H-containing freons only while for hydrogen-free ozone-depleting freons like CF2Cl2 (freon 12) and C2F3Cl3 (freon 113) it is not detected, At the photostimulated adsorption, fluorine and chlorine atoms seem to substitute oxygen atoms in the magnesium oxide lattice and hydroxyl groups of calcium hydroxycarbonates. It was found that the observed photoadsorption phenomena might be related also with the presence of a certain amount of N2O natively adsorbed on the alkaline earth metal oxides exposed to ambient air.
Cite:
Parmon V.N.
, Zakharenko V.S.
Destructive Photoadsorption of Freons on Atmospheric Aerosols
Zeitschrift fur Physikalische Chemie-International Journal of Research in Physical Chemistry and Chemical Physics. 1999. V.213. N1. P.9-16. DOI: 10.1524/zpch.1999.213.Part_1.009 WOS Scopus РИНЦ
Destructive Photoadsorption of Freons on Atmospheric Aerosols
Zeitschrift fur Physikalische Chemie-International Journal of Research in Physical Chemistry and Chemical Physics. 1999. V.213. N1. P.9-16. DOI: 10.1524/zpch.1999.213.Part_1.009 WOS Scopus РИНЦ
Dates:
Submitted: | Aug 24, 1998 |
Accepted: | Dec 10, 1998 |
Published print: | Jan 1, 1999 |
Published online: | Sep 30, 1999 |
Identifiers:
Web of science | WOS:000084195300002 |
Scopus | 2-s2.0-0005932534 |
Elibrary | 13313135 |
Chemical Abstracts | 1999:747639 |
Chemical Abstracts (print) | 131:355230 |
OpenAlex | W2324976558 |